Yikes, that looks more like an indentation from over torquing that has now grown in to a crack. Just curious, how much torque are you applying when setting your seat mast? Trek might balk and consider this user error or they might just be good guys and send u a new frame. EM3

I noticed the same thing on my Madone last week that I bought second hand. I haven't ridden it yet but wondered if it was just an indentation or a crack. Mine is less pronounced though. Please follow up on what you end up doing or what ends up happening with your warranty.

@ shinobiph, not wanting to fan any flames here, but in the photo you attached of the ISP topper installed shows that the slot is cinched together perhaps too far. This can be a result of the manufacturer's tolerances between the frame and the topper not being optimal. (Is that not called tolerance stacking?) If the ISP topper was orignally on the high end of the diameter tolerance and the frame on the low end, then you would have to crank that topper pretty far to get it to stay put, resulting in the crack. (I would not be riding that if I were you.) 7 NM max torque should not be required to hold it all in place if the tolerances are correctly mated.

As others have stated though, we are guessing. Go talk to the local Trek shop and ask them for their advice.

If it cannot be warrantied, then there are many carbon repair shops out there who do good work and would have that Trek back on the road again soon for not too much money. (Consider getting a new topper though if that is possible) Not sure where you are located but the forum can assist with carbon repair contacts as needed.

Definitely take it to a Trek dealer. Also, take the torque wrench, just in case. It may be that the wrench was not properly calibrated, and what you think is 5nm is more. The best way for them to examine it is with the wrench, so it can be tested (especially if Trek denies the warranty).

Also, if they deny the warranty, be prepared with your state's Comptroller's (or Secretary of State) office number, and file a complaint (if in the US). That's a relatively new frame, and no reason for it to be cracking like that, unless you haven't given us the full info.

Very true. Not that you always have to get stuff at you LBS but when you do or when you have gotten plenty of stuff at the LBS, so you have a good relationship, they can (and are will) really help you out and "go to bat, for you".

Glad a new frame is on the way. (+1 for the LBS and Trek, for not giving you a hard time. Always nice to see good customer service and companies who back up their products)

personally, always 5Nm. i know because i've never used anything other than the preset [bontrager] torque wrench that came with the bike.

glad to hear you are getting a new frame....hope you don't let that Bontrager torque wrench go anywhere near your new frame. Apply only the needed torque to fix the mast on your ISP without going over the MAX torque rating for the bolt (the stamped value on the mast is MAX value for for the bolt, not the recommend torque for installing the seat mast). It may only need 4 Nm and a bit or carbon paste will result in needing less torque.

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